Activate startup traces on serial console by editting /etc/default/grub file and setting the GRUB_CMDLINE_LINUX_DEFAULT variable to "console=ttyS0". Also change the boot menu timeout to 0 (sometimes virtual machines get stopped on the boot menu when starting on high loaded systems):

Note: to avoid nautilus being launched any time you remotely execute a command on the virtual machine using VNX (which interferes with the normal execution of commands), you should disable the start of programs when media insertion takes place. Go to "System settings->System->Details->Removable Media" and deselect the checkbox "Never prompt or start programs on media insertion".

In Ubuntu 12.04 Desktop, graphical commands execution does not work. Command execution fails with "ERROR: no user logged on display :0.0" (see /var/log/vnxaced.log). If you just open a "terminal" window, commands work correctly (does not work if you open other applications; only when you start a terminal...).

Each time a cdrom is mounted (for example, whenever a command is executed on the virtual machine) the following error appears in the console: